MISC
What is the first step in a stoichiometry problem?
Balance the equation
C5H12 + 8O2 = 5CO2 + 6H2O
What are number of moles of carbon dioxide can I make if I start with 16 moles of oxygen gas?
10 moles
What is stoichiometry?
Latin for 'measuring elements'
What do you use to convert from number of moles to volume?
Multiply by 22.4 Liters.
Where do you find the mass of an element?
The decimal number on the elemental box on the periodic table.
What is a mole ratio?
A conversion factor that relates the amounts in moles of any two substances involved in a chemical reaction.
Found in the balanced equation.
C5H12 + 8O2 = 5CO2 + 6H2O
How many moles of H20 are made if I use 32 moles of O2?
23 moles
What do we look at to find mole ratios?
The coefficients in a balanced equation.
What do you use to convert from number of moles to # of particles?
Multiply by Avogadro's Number.
What is the molar mass of Fe2O3 ?
159.69 g/mol
What is Avogadro's Number?
A mole
6.02x10^23
DAILY DOUBLE: How many grams of NaCl will be produced from 1.25 mol of chlorine gas reacting with sodium?
146 g
What is 22.4 liters?
The number of liters of one mole of a gas @ STP.
What do you use to convert from grams to number of atoms?
Divide by molar mass, multiply by Avogadro's Number.
What is the molar mass of calcium hydroxide.
74 grams/mol
How many moles are present in 34 grams of Cu(OH)2?
.35 moles
Ammonium nitrate decomposes into dinitrogen monoxide gas and water. Determine the amount in grams of water produced if 25.0 g of ammonium nitrate decomposes.
11.3grams H2O
How many atoms is .5 moles of hydrogen?
3.01 x 1023 atoms of hydrogen
What do you use to convert from volume to grams?
Divide by 22.4 Liters then multiply by molar mass.
How many grams is 7 moles of magnesium?
168 grams
What is the Law of Conservation of Mass?
States that mass is neither created nor destroyed during ordinary chemical reactions.
___H2 + ___ O2 --> ___ H2O The number of grams of oxygen gas which are needed to produce 10 grams of water is what?
8.89 grams of O2
How do you find the molar mass of something?
Look at the periodic table.
What do you use to convert from molecules to grams?
Divide by Avogadro's Number then multiply by molar mass
___CH4 + ___O2 --> ___ CO2 + ___H2O If I want to get 5.3 moles of water, how many moles of methane do I need?
2.65 moles of methane